As believable as it looks on screen, the execution of sex scenes in front of cameras and a crew can’t possibly feel natural. We checked in with some Hollywood vets about faking it.

In the her most recent film, “Going the Distance,” Drew Barrymore starred with her real-life on-again-off-again boyfriend, Justin Long. In her own words, she believes that a shooting a sex scene makes for a “great day at work.”

However, not everyone shares her enthusiasm. In an interview for W magazine, Michelle Williams and Ryan Gosling referred to their erotic scene, filmed for their new movie “Blue Valentine,” as being “toxic.” Williams confessed that in order to make it feasible, “Ryan and I stopped relating to each other.” She adds, “I had a long drive from set to home each night, and I would roll down all the windows and turn up the music and hang my head out the window like a dog and scream. It was my escape.”

Other celebrities, like Barrymore, believe that sex and the camera are not incompatible. Anna Paquin, of HBO’s “True Blood,” admitted at that she enjoys shooting naked scenes in the morning. “I prefer to get naked earlier in the day and kill people in the later part of the day,” she told fans at Comic Con. “Especially if things are going to be particularly messy, because then you won’t have stuff all over yourself for lunch.”

Then again, she gets naked with co-star and real-life husband Stephen Moyer, which might alleviate some of the awkwardness.